diff --git a/Casks/f/ff-works.rb b/Casks/f/ff-works.rb
index f2ba2af189..009379228e 100644
--- a/Casks/f/ff-works.rb
+++ b/Casks/f/ff-works.rb
@@ -1,5 +1,5 @@
 cask "ff-works" do
-  version "3.8.1"
+  version "4.0"
   sha256 :no_check
 
   url "https://www.ffworks.net/ffWorks.dmg"